You can STEAL WYVERN eggs using the invisibility ability at night

You should tame a low level first get tons of blood packs then tame a high level

Tame a bad level first than tame high level with the blood packs that it gives you

Blood extraction syringe + snow owl = easy blood packs to tame your first desmodus

Steps to Tame a high level Desmodus with 100% Effektiveness (you need a low level Desmodus to start) :

Step 1: Tame a Stego/Andrewsarchus and saddle them (the saddle on the Andrew is essential!)

Step 2: Tame a Moschops of any level

Step 3: Farm 400-600 Bloodpacks

Step 4: After finding your target Desmodus take out your Stego/Andrewsarchus and your Moschops

Step 5: Put all the Bloodpacks except for the last 100 in the Moschops (the other 100 you keep in your own inventory)

Step 6: put the Moschops on "Following: Lowest" and let it follow your Andrew/Stego

Step 7: Aggro the Desmodus by approaching it and let it grab the moschops, the Desmodus will eat 10 Bloodpacks from the Moschops' inventory and then drop it, this will raise its Effectiveness by 1-3% (repeat this until the Desmodus is at 100% Effectivness. Do not unmount while doing this!)

Step 8: once the Desmodus is at 100% Effectiveness unmount and offer yourself up to the Desmodus. It will grab you and eat 10 Bloodpacks and then drop you.

Step 9: after it dropped you immediately mount your Andrew/Stego again. And let it grab the Moschops again so it's Effectiveness goes back up to 100%

Step 10: Repeat Step 8 & 9 until the Desmodus is tamed.

This will allow you to get perfect tames.

Babies CAN EAT MEAT as a baby to raise them.

In Fjordur the spawn locations are :

Latitude:38 Longitude:75, inside a cave under a waterfall

Latitude: 90 Longitude: 78, cave as well

Latitude: 50 Longitude: 14, cave

Use a Daedon, put meat inside, set to passive, passive healing on and kill all the other desmodus until there is only one, then duck under the Daedon and the desmodus will grab it, suck it's blood and the effectiveness will go up 3-4%, don't leave the area, hide and wait until 100%. Once 100% effectiveness, let it grab you (make sure you have 150-200 blood packs) and you'll tame it. Use cryopods if possible to bring back the Daedon.

They can't dismount you from an Andrewsarchus saddle sit safely within the cockpit and pick off the bats you don't want

Use tames that is carry-able by the desmodus that's on wonder and passive and get the desmodus to pick it up several times and this will increase taming effectiveness .

Make sure to have parachutes because they fly up when taming and will drop you.

Man there’s all these tips about how everyone loves it’s art—and here we are, and it’s cartoon is no more

-Moon

Babies take bloodpacks as food when raising.

Demos are just bigger onycs that you can ride

They also spawn in the cave near the emerald trench.

Lat: 68.2

Lon: 37.3

You Need A Blood Extaction Sryringe Then Get Blood From You DONT Drink It Go In A Trench Or A Cave If You See A Hanging Pod On The Roof A GIANT Bat Will Come Out Wait For It To Pick You Up Then Have The Blood Packs In Your Inventory Becuse It Will Drink The Blood Packs And The Tameing Bar Will Fill Up When It Drinked ALL Of The Blood Packs And It’s Not Tamed You HAVE To Get Some More Blood From Your Character And It Will Keep Drinking Them But You MIGHT Be LOW On Health.

To raise baby put blood and meat in maewing then it wil eat Every 7 minutes with out blood in maewing it eat evry 30 sec

Try to tame a low level one first so you can farm blood packs with it, it'll shorten the farming time for a high level bat.

You can also tame a Daeodon first and use it's healing aura when extracting the first few packs, the pig can also help you raise the taming effectiveness for future high level tames, just let it wander on passive near the Desmodus you want to tame, keep some blood packs on it's inventory and let it get picked, it'll raise the effectiveness.

Let it pick you afterwards and feed on your blood packs to raise the taming meter, when it's about to tame, be sure to check if the effectiveness is close to 100%, if not just let it pick the Daeodon some more.

I haven’t seen anyone mention anything about babies but they eat raw meat they won’t drink blood the blood packs. Hope this helps

A 150 is about 170 blood packs on 1x offical

It can turn invisible at night and while it is latched upside down during both night and day. Every time it bites a creature, it adds blood packs to it's inventory, making it good to use to tame bloodstalkers. It collects tons of spoiled meat when it eats corpses making it also good for narcotic farming. It has echolocation which allows it to ping all nearby creatures, and finally it has the ability to dive similar to the griffin and snow owl. It's tamed passively by putting blood packs in the last slot of your hotbar and letting it pick you up.